gilles conan

caustics - the swimming pool - group exhibition
espace croix-baragnon - toulouse -france
coloured lighting filters  / 019 red fire + 174 steel blue
dimensions 120 x 450 cm

the word caustic comes from the greek καυστός, burnt, via the latin causticus, burning.
in optics, it is the envelope of light rays reflected or refracted by a curved surface or object, or the projection of that envelope of rays on another surface.
the caustic is a curve or surface to which each of the light rays is tangent, defining a boundary of an envelope of rays as a curve of concentrated light.